CN113416295A - Running board buffer layer and preparation method thereof - Google Patents
Running board buffer layer and preparation method thereof Download PDFInfo
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- CN113416295A CN113416295A CN202110763726.0A CN202110763726A CN113416295A CN 113416295 A CN113416295 A CN 113416295A CN 202110763726 A CN202110763726 A CN 202110763726A CN 113416295 A CN113416295 A CN 113416295A
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- C08G18/2045—Heterocyclic amines; Salts thereof containing condensed heterocyclic rings
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- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
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Abstract
The invention discloses a running board buffer layer which comprises the following components in parts by weight: 80-90 parts of polyol, 25-35 parts of isocyanate, 0.2-0.5 part of catalyst, 0.3-0.7 part of stabilizer and 2-4 parts of water, wherein the polyol is a mixture of graft polyether polyol and high-activity polyether polyol. The running board buffer layer has the characteristics of small deformation, good support performance and good resilience performance, can buffer and absorb impact force and vibration generated by running, and has good shock absorption and sound absorption effects. The temperature rise of the prepared running board is less than 40 ℃ when the running board runs continuously under 100kg load, and the noise is less than 65 dB.
Description
Technical Field
The invention relates to the technical field of running plates, in particular to a running plate buffer layer and a preparation method thereof.
Background
When the treadmill is used for running or walking exercise, a person steps on a running belt of the treadmill to walk (run) forwards, and the running belt runs backwards. The weight of the human body and the impact force generated by running are born by the running board at the lower part of the running belt. The base material of the running board is the Medium Density Fiberboard (MDF) which is generally used at present, a layer of melamine formaldehyde resin impregnated paper is pasted on the surface of the MDF, and after the melamine formaldehyde resin is cured, the melamine formaldehyde resin is flat, smooth, hard, wear-resistant and low in friction coefficient, so that the base material is generally adopted. However, when a person runs on the running machine, the running board can generate sound of bang, and continuous running can generate continuous sound of bang and bang, which is very annoying. The applicant has developed a running board, adds the cotton buffer layer of one deck bubble on medium density fiberboard, and the wearing layer is made to the cotton even layer film that adds of bubble, and this kind of running board effect is very good when beginning, has eliminated and has stepped on the noise, and the travelling comfort is also fine, nevertheless is not durable, uses a period of time after, and the cotton deformation of bubble of buffer layer is big, and support performance, resilience performance decline greatly, influence the running board quality.
Disclosure of Invention
The invention aims to provide a running board buffer layer and a preparation method thereof, and aims to solve the problems of large deformation, poor support performance and poor resilience of the conventional running board buffer layer.
In order to achieve the above purpose, the invention provides the following technical scheme:
the running board buffer layer comprises the following components in parts by weight: 80-90 parts of polyol, 25-35 parts of isocyanate, 0.1-0.3 part of catalyst, 0.3-0.7 part of stabilizer and 2-4 parts of water, wherein the polyol is a mixture of graft polyether polyol and high-activity polyether polyol, and the weight part ratio of the graft polyether polyol to the high-activity polyether polyol is (1-2): 1.
further, the grafted polyether polyol is prepared by the following method: adding polyglycerol-oxypropylene ether with the molecular weight of 300-500, an initiator and a vinyl monomer into a reactor filled with nitrogen, stirring and reacting for 5-6 hours at 80-90 ℃ to obtain a dispersion, heating the dispersion for 1-1.5 hours at the temperature of 100 ℃ under the vacuum degree of 0.24-0.28KPa, and removing unreacted monomers to obtain the grafted polyether polyol.
According to the unsaturated olefin monomer-vinyl monomer graft polymerization modified common oxidized olefin polyether polyol-polyglycerol-propylene oxide ether, the high polymer and large-volume side group are introduced, so that the rotation barrier and the internal friction force of a molecular chain are increased, namely the rigidity of molecular chain links is increased, and therefore the buffer layer foam of the running board prepared from the obtained graft polyether polyol has higher hardness and bearing performance, the rebound resilience and compression load performance of the buffer layer can be greatly improved, and the buffer layer has higher mechanical strength and excellent fatigue resistance and impact resistance.
Further, the weight ratio of the polyglycerol-oxypropylene ether to the initiator to the vinyl monomer is (60-80) to 1:20, and the initiator is benzoyl peroxide or azodiisobutyronitrile; the vinyl monomer is a mixture of acrylonitrile and styrene, and the weight ratio of the acrylonitrile to the styrene is (1-2) to 1.
According to the invention, the vinyl monomer is a mixture of acrylonitrile and styrene, the weight ratio of the acrylonitrile to the styrene is (1-2):1, and compared with the single use of the acrylonitrile or the styrene, the storage stability of the grafted polyether polyol can be greatly improved. The weight ratio of the polyglycerol-oxypropylene ether to the initiator to the vinyl monomer is (60-80):1:20, so that the prepared grafted polyether polyol can obtain a lower hydroxyl value, and the elasticity of the running board buffer layer is improved.
Furthermore, the molecular weight of the grafted polyether polyol is 5000-6000, and the hydroxyl value is 40-45 mgKOH/g.
Furthermore, the high-activity polyether polyol is prepared by introducing an ethylene oxide chain segment into a polypropylene oxide ether end group.
By introducing an ethylene oxide segment into a polyoxypropylene ether terminal group, a secondary hydroxyl group can be converted into a primary hydroxyl group, thereby improving reactivity. The reaction speed of the primary hydroxyl part and isocyanate is 3-4 times higher than that of the secondary hydroxyl, so that an ethylene oxide chain segment is introduced into the end group of the polyoxypropylene ether, the secondary hydroxyl is converted into the primary hydroxyl, the running board buffer layer can be molded at normal temperature, the cold curing purpose is achieved, the hot curing is avoided, the preparation safety is improved, and the energy is saved.
Furthermore, the molecular weight of the high-activity polyether polyol is 3000-4000, and the hydroxyl value is 20-35 mgKOH/g.
Further, the isocyanate is 1, 5-naphthalene diisocyanate, the catalyst is a mixture of a tertiary amine catalyst and an organotin catalyst, and the stabilizer is an organosilicon stabilizer. The silicone stabilizer may be polydimethylsiloxane.
Further, the weight ratio of the tertiary amine catalyst to the organotin catalyst is 1: (1-2), the tertiary amine catalyst is one of tetramethyl butanediamine and triethylene diamine, and the organic tin catalyst is one of stannous octoate and dibutyltin dilaurate.
The tertiary amine catalyst has the main function of foaming reaction, has high activity, quick foaming, quick initial viscosity increase, easy opening of foam pores and low system stability. The organotin catalyst mainly acts on chain growth reaction, and the gel reaction is faster, thereby being beneficial to the completion of the whole reaction. Therefore, the tertiary amine catalyst and the organic tin catalyst are compounded in a synergistic manner, the alkaline amine is close to the active intermediate generated by the isocyanate and the organic tin catalyst and is connected to the carbonyl of the isocyanate, so that the active intermediate is stable, the catalytic effect can be greatly enhanced, the better catalytic effect can be achieved under the condition of lower using amount, the reaction speed of the running board buffer layer can be accelerated, and the stability of the buffer layer system can be improved.
The invention also provides a preparation method of the running board buffer layer, which comprises the following steps: adding polyol, a catalyst, a stabilizer and water in parts by weight into a stirring kettle, heating and stirring for 20-30 minutes, cooling to normal temperature to be used as a component A for later use, mixing isocyanate and the component A by using a high-pressure foaming machine or a low-pressure foaming machine, then quantitatively injecting into a mold with a bottom plate and a panel placed, closing the mold for foaming, and demolding to obtain the running plate buffer layer.
The preparation of the running board buffer layer of the invention is cured at normal temperature, thus improving the convenience and safety and saving energy.
Further, the heating and stirring are specifically heating at 40-45 ℃, and the stirring speed is 200-500 rpm.
Compared with the prior art, the running board buffer layer and the preparation method thereof provided by the invention have the following beneficial effects:
the running board buffer layer has the characteristics of small deformation, good support performance and good resilience performance, can buffer and absorb impact force and vibration generated by running, and has good shock absorption and sound absorption effects. The temperature rise of the prepared running board is less than 40 ℃ when the running board runs continuously under 100kg load, and the noise is less than 65 dB.
Through the synergistic compounding of the graft polyether polyol and the high-activity polyether polyol, the running plate buffer layer has high mechanical strength, fatigue resistance and impact resistance under cold curing.
Further, the tertiary amine catalyst and the organic tin catalyst are compounded in a synergistic manner, so that a good catalytic effect can be achieved under the condition of a low dosage, the reaction speed of the running board buffer layer can be increased, and the stability of the buffer layer system can be improved.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
A running board buffer layer comprises the following components in parts by weight: 60 parts of grafted polyether polyol, 30 parts of high-activity polyether polyol, 25 parts of 1, 5-naphthalene diisocyanate, 0.1 part of catalyst, 0.7 part of polydimethylsiloxane and 2 parts of water. The catalyst is a mixture of tetramethyl butanediamine and stannous octoate, and the weight ratio of the tetramethyl butanediamine to the stannous octoate is 1: 1.
the grafted polyether polyol is prepared by the following method: adding polyglycerol-oxypropylene ether with molecular weight of 300, benzoyl peroxide and vinyl monomer into a reactor filled with nitrogen, stirring at 90 ℃ for reaction for 5 hours to obtain a dispersion, heating the dispersion at 100 ℃ under vacuum degree of 0.24KPa for 1.5 hours, and removing unreacted monomer to obtain the grafted polyether polyol. The weight ratio of the polyglycerol-oxypropylene ether to the benzoyl peroxide to the vinyl monomer is 80:1:20, the vinyl monomer is a mixture of acrylonitrile and styrene, and the weight ratio of the acrylonitrile to the styrene is 1: 1.
The molecular weight of the grafted polyether polyol is 5000, the hydroxyl value is 45mgKOH/g, the molecular weight of the high-activity polyether polyol is 4000, and the hydroxyl value is 20 mgKOH/g.
The preparation method of the above example 1 comprises the following steps: adding the grafted polyether polyol, the high-activity polyether polyol, the tetramethylbutanediamine, the stannous octoate, the polydimethylsiloxane and the water into a stirring kettle according to the parts by weight, heating to 45 ℃, stirring for 20 minutes, cooling to normal temperature to serve as a component A for later use, mixing the 1, 5-naphthalene diisocyanate and the component A by using a high-pressure foaming machine or a low-pressure foaming machine, then quantitatively injecting into a mold with a bottom plate and a panel placed, closing the mold for foaming, and demolding to obtain the running board buffer layer, wherein the stirring speed is 500 revolutions per minute.
Example 2
A running board buffer layer comprises the following components in parts by weight: 40 parts of grafted polyether polyol, 40 parts of high-activity polyether polyol, 35 parts of 1, 5-naphthalene diisocyanate, 0.3 part of catalyst, 0.3 part of polydimethylsiloxane and 4 parts of water. The catalyst is a mixture of triethylene diamine and dibutyl tin dilaurate, and the weight ratio of the triethylene diamine to the dibutyl tin dilaurate is 1: 2.
the grafted polyether polyol is prepared by the following method: adding polyglycerol-oxypropylene ether with the molecular weight of 500, azodiisobutyronitrile and vinyl monomer into a reactor filled with nitrogen, stirring and reacting for 6 hours at 80 ℃ to obtain a dispersion, heating the dispersion for 1 hour at the temperature of 100 ℃ under the vacuum degree of 0.28KPa, and removing unreacted monomer to obtain the grafted polyether polyol. The weight ratio of the polyglycerol-oxypropylene ether to the azodiisobutyronitrile to the vinyl monomer is 60:1:20, the vinyl monomer is a mixture of acrylonitrile and styrene, and the weight ratio of the acrylonitrile to the styrene is 2: 1.
The molecular weight of the grafted polyether polyol is 6000, the hydroxyl value is 40mgKOH/g, the molecular weight of the high-activity polyether polyol is 3000, and the hydroxyl value is 35 mgKOH/g.
The preparation method of the above example 2 comprises the following steps: adding the grafted polyether polyol, the high-activity polyether polyol, the triethylene diamine, the dibutyltin dilaurate, the polydimethylsiloxane and the water into a stirring kettle according to the parts by weight, heating to 40 ℃, stirring for 30 minutes, cooling to normal temperature to serve as a component A for later use, mixing the 1, 5-naphthalene diisocyanate and the component A by using a high-pressure foaming machine or a low-pressure foaming machine, quantitatively injecting into a mold with a bottom plate and a panel placed, closing the mold for foaming, and demolding to obtain the running board buffer layer, wherein the stirring speed is 200 revolutions per minute.
Example 3
A running board buffer layer comprises the following components in parts by weight: 45 parts of grafted polyether polyol, 40 parts of high-activity polyether polyol, 30 parts of 1, 5-naphthalene diisocyanate, 0.2 part of catalyst, 0.5 part of polydimethylsiloxane and 3 parts of water. The catalyst is a mixture of triethylene diamine and stannous octoate, and the weight ratio of the triethylene diamine to the stannous octoate is 1: 1.
the grafted polyether polyol is prepared by the following method: adding polyglycerol-oxypropylene ether with molecular weight of 400, benzoyl peroxide and vinyl monomer into a reactor filled with nitrogen, stirring and reacting at 85 ℃ for 5.5 hours to obtain a dispersion, heating the dispersion at the temperature of 100 ℃ under the vacuum degree of 0.26KPa for 1.3 hours, and removing unreacted monomer to obtain the grafted polyether polyol. The weight ratio of the polyglycerol-oxypropylene ether to the benzoyl peroxide to the vinyl monomer is 70:1:20, the vinyl monomer is a mixture of acrylonitrile and styrene, and the weight ratio of the acrylonitrile to the styrene is 1: 1.
The molecular weight of the grafted polyether polyol is 5500, the hydroxyl value is 40mgKOH/g, the molecular weight of the high-activity polyether polyol is 3500, and the hydroxyl value is 30 mgKOH/g.
The preparation method of the above example 3 comprises the following steps: adding the grafted polyether polyol, the high-activity polyether polyol, the triethylene diamine, the stannous octoate, the polydimethylsiloxane and the water into a stirring kettle according to the parts by weight, heating to 45 ℃, stirring for 20 minutes, cooling to normal temperature to serve as a component A for later use, mixing the 1, 5-naphthalene diisocyanate and the component A by using a high-pressure foaming machine or a low-pressure foaming machine, quantitatively injecting into a mold with a bottom plate and a panel placed, closing the mold for foaming, demolding to obtain the running board buffer layer, and stirring at the speed of 400 revolutions per minute.
Comparative example 1
The difference from example 3 is that the polyol in comparative example 1 is a high activity polyether polyol.
Comparative example 2
The difference from example 3 is that in the preparation of the graft polyether polyol of comparative example 2, the vinyl monomer is acrylonitrile.
Comparative example 3
The difference from example 3 is that the catalyst in comparative example 3 is triethylenediamine.
The performance of the running board buffer layer was measured according to examples 1 to 3 and comparative examples 1 to 3, and the results are shown in the following table 1:
TABLE 1
Wherein, the indentation ratio test: under the same test environment condition, the test is carried out according to method B of GB/T10807-2006 method for testing the hardness of the soft foamed polymer material (indentation method), wherein the indentation hardness value of 65 percent/indentation hardness value of 25 percent is the indentation ratio.
And (3) measuring the tensile strength: the measurement method used is a method commonly used in the industry, and the tensile strength in the test results is 100% of the result of example 3, and the results of the other groups are calculated ratios with respect to the result of example 3.
Determination of elongation at break: the measurement method used is a method commonly used in the industry, and the elongation at break in the test results is 100% of the result of example 3, and the results of the other groups are calculated ratios with respect to the result of example 3.
And (3) measuring the tearing strength: the measurement method used is a method commonly used in the industry, and the tear strength in the test results is 100% of the result of example 3, and the results of the other groups are calculated ratios with respect to the result of example 3.
As can be seen from Table 1, examples 1 to 3 have better tensile strength, elongation at break, tear strength, stuffing ratio and impact resistance than comparative examples 1 to 3, indicating that the running board cushioning layer of the present invention has the characteristics of superior shock absorption cushioning property, good support property, small deformation and good rebound resilience.
The buffer layer foam cotton can be directly adhered to the running board substrate, or can be directly foamed and adhered on the running board substrate in the preparation process, the running board provided with the buffer layer is installed on a running machine, the temperature rise of the running board is less than 40 ℃ when the running board continuously runs under 100kg load, and the noise is less than 65 dB.
The features of the embodiments and embodiments described above may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The running board buffer layer is characterized by comprising the following components in parts by weight: 80-90 parts of polyol, 25-35 parts of isocyanate, 0.1-0.3 part of catalyst, 0.3-0.7 part of stabilizer and 2-4 parts of water, wherein the polyol is a mixture of graft polyether polyol and high-activity polyether polyol, and the weight part ratio of the graft polyether polyol to the high-activity polyether polyol is (1-2): 1.
2. the running board buffer layer according to claim 1, characterized in that the graft polyether polyol is prepared by the following method: adding polyglycerol-oxypropylene ether with the molecular weight of 300-500, an initiator and a vinyl monomer into a reactor filled with nitrogen, stirring and reacting for 5-6 hours at 80-90 ℃ to obtain a dispersion, heating the dispersion for 1-1.5 hours at the temperature of 100 ℃ under the vacuum degree of 0.24-0.28KPa, and removing unreacted monomers to obtain the grafted polyether polyol.
3. The running board buffer layer according to claim 2, wherein the weight ratio of the polyglycerol-oxypropylene ether, the initiator and the vinyl monomer is (60-80) to 1:20, the initiator being benzoyl peroxide or azobisisobutyronitrile; the vinyl monomer is a mixture of acrylonitrile and styrene, and the weight ratio of the acrylonitrile to the styrene is (1-2) to 1.
4. The running board buffer layer as claimed in claim 3, wherein the grafted polyether polyol has a molecular weight of 4000-5000 and a hydroxyl value of 40-45 mgKOH/g.
5. The running board deck as defined in claim 1, wherein the high activity polyether polyol is made by introducing ethylene oxide segments at the end of a polyoxypropylene ether.
6. The running board buffer layer as claimed in claim 5, wherein the high activity polyether polyol has a molecular weight of 5000-.
7. The running board buffer layer according to claim 1, wherein the isocyanate is 1, 5-naphthalene diisocyanate, the catalyst is a mixture of a tertiary amine catalyst and an organotin catalyst, and the stabilizer is an organosilicon stabilizer.
8. The running board buffer layer according to claim 7, wherein the weight ratio of the tertiary amine catalyst and the organotin catalyst is 1: (1-2), the tertiary amine catalyst is one of tetramethyl butanediamine and triethylene diamine, and the organic tin catalyst is one of stannous octoate and dibutyltin dilaurate.
9. A method of manufacturing a running board buffer layer according to any of claims 1-8,
the method comprises the following steps: adding polyol, a catalyst, a stabilizer and water in parts by weight into a stirring kettle, heating and stirring for 20-30 minutes, cooling to normal temperature to be used as a component A for later use, mixing isocyanate and the component A by using a high-pressure foaming machine or a low-pressure foaming machine, then quantitatively injecting into a mold with a bottom plate and a panel placed, closing the mold for foaming, and demolding to obtain the running plate buffer layer.
10. The method as claimed in claim 9, wherein the heating and stirring are performed at 40-45 ℃ and a stirring rate of 200-500 rpm.
Priority Applications (1)
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| CN110016114A (en) * | 2019-04-24 | 2019-07-16 | 东莞市腾崴塑胶制品有限公司 | A kind of full open aperture height is breathed freely sponge and preparation method |
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| CN110016114A (en) * | 2019-04-24 | 2019-07-16 | 东莞市腾崴塑胶制品有限公司 | A kind of full open aperture height is breathed freely sponge and preparation method |
Non-Patent Citations (2)
| Title |
|---|
| 刘益军 主编: "《聚氨酯原料及助剂手册》", 28 February 2017, 化学工业出版社 * |
| 方禹声 等: "《聚氨酯泡沫塑料》", 31 August 1994, 化学工业出版社 * |
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